<?php 
if(arg(0) == 'node' and (!is_null(arg(1))) ){
    $nid = arg(1);
    $node = node_load($nid);
    
    $uri_btn = $node->field_imagem_topo[key($node->field_imagem_topo)][0]["uri"];
    $url_btn = image_style_url('imagem_topo',$uri_btn);
}
?>

<div class="i-slider" style="background-image:url(<?= $url_btn;?>)">
    <img src="<?= $url_btn;?>" align="center">
</div>

